Do YOU know what happened in that one helicopter?

Crash Course DLC is here! Find out what happens to Bill, Zoey, Louis, and Francis after their rooftop helicopter rescue in the No Mercy campaign.

Well, I do know what happened there! I even know what happened in the helicopter! I found this soundtape that recorded the survivors and the pilot, and now I'd like to share it with you!
[note: this is obviously fake, and made by me]

That was soo spot on.
"In the original version, the pilot was complaining about having just done a street pickup that hadn't gone so well. In a later cut-scene the pilot turned into a zombie, crashed the helicopter and that was the start of death toll. While this was a good way to provide continuity, playtesters were annoyed that they had just completed the entire no mercy campaign only to wind up stranded again"-developer commentry (from memory).

That YouTube clip is not the same file he posted ... did you even bother listening to his? The one you posted is just one guy; the OP's file has multiple people conversing. Granted it appears to use the same bit of speech the YouTube one does, but it's mixed in with other elements to be something separate.